SPARQL是另一种查询方法，不一定要立即替换SQL。
SPARQL is an additional method of querying, not necessarily an immediate replacement of SQL.
一种查询方法是，创建持久化对象的一个实例，然后填充需要用搜索条件搜索的字段。
One approach to querying is to create an instance of the persistent object and populate the fields on which to search with the search criteria.
确定事件具体类型的另一种方法是使用为此提供的布尔查询方法。
Another way to determine the concrete type of the event is to use one of the Boolean query methods provided for this purpose.
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